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<p>Accurate and comprehensive thermodynamic data are essential for the development of environmentally friendly and efficient vanadium extraction technologies. However, there is a significant lack of thermodynamic data for vanadium-containing systems in the current thermodynamic databases. In this study, the isotherm phase diagram of the TiO<sub>2</sub>–Fe<sub>2</sub>O<sub>3</sub>–V<sub>2</sub>O<sub>5</sub> system at 1300°C in an air atmosphere was systematically constructed through an electron probe micro-analyzer. The study identified a single liquid phase region, two two-phase regions (liquid–pseudobrookite and liquid–rutile), and two three-phase regions (liquid–rutile–pseudobrookite and liquid–pseudobrookite–hematite). Furthermore, significant discrepancies were found between the current experimental results, literature data, and thermodynamic calculations. This research provides valuable insights for enhancing the thermodynamic database of vanadium-containing systems and contributes to the development and optimization of vanadium extraction processes.</p>

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Phase Equilibria of the TiO2–Fe2O3–V2O5 System at 1300°C in Air

  • 期刊论文

  • 发表日期：

    2025年3月27日

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  • Yuchao Qiu,
  • Sheng Li,
  • Junjie Shi,
  • Yongsheng Sun,
  • Wenyi He,
  • Bin Yu,
  • Guangchao Du,
  • Jianzhong Li

摘要

Accurate and comprehensive thermodynamic data are essential for the development of environmentally friendly and efficient vanadium extraction technologies. However, there is a significant lack of thermodynamic data for vanadium-containing systems in the current thermodynamic databases. In this study, the isotherm phase diagram of the TiO2–Fe2O3–V2O5 system at 1300°C in an air atmosphere was systematically constructed through an electron probe micro-analyzer. The study identified a single liquid phase region, two two-phase regions (liquid–pseudobrookite and liquid–rutile), and two three-phase regions (liquid–rutile–pseudobrookite and liquid–pseudobrookite–hematite). Furthermore, significant discrepancies were found between the current experimental results, literature data, and thermodynamic calculations. This research provides valuable insights for enhancing the thermodynamic database of vanadium-containing systems and contributes to the development and optimization of vanadium extraction processes.